Kichaed metzgee



Patented Dec. 14, 192$,

. UNITED: STATES PATENT OFFICE.

rarcnann mn'r'zena, or HEIDELBERG, GERMANY, essrenon To I. a. salesmann'os'rnm exrrnnensnnnsonur, or rmxronr-om'rnrruAm, GERMANY.

rnocnss non DYEING' cELLULosn-Acnrlmr: srnx.

m Drawing. Application filed July 1925, Serial 1%. 42,045, and in Germany m 11, 1924.

My present invention has for its object'to provide for an improved process of -producing dyeings on cellulose acetate silk;

l have found that cellulose acetate silk can be dyed in an excellent manner with numerous insoluble or difiicultly soluble com-- pounds when dyeing is carried out in the such presence of so-called fat catalytic organic saponifiers i. e. chemical compounds possessing the property of assisting the hydrolysis of fats and oils by acids, such for example as 'Twitchells reagent, napthenic acids, mixed fatty acid and napht acids, also alkylated naphthalene sulfonic acids, for example i'sopropylated naphthalene orbutylated or isobutylated naphthalene'sulfonic acids, or salts thereof. 'lih'e compounds used for dyeing with the aid of the aforesaid sagonifiers may be coloring matters or colore organic compounds generally, insoluble or difiicultly soluble in I water as well as components of dyestufis, for example as ammo compounds which afterwards are diazotized on the fibre and coupled with suitable compounds, ornaphthols or similar components which afterwards are to be developed with diazo 'compounds.- I

For dyeing, the compounds to be brought on the fibre may be first made into a concen-' trated solution, generally of 2 colloidal nature, or otherwise finely dis rsed in aconcentrated form by an add1tion of one or more of the aforesaid saponifi'ers, and a dyebath prepared by diluting such concentrated preparation, or the dye-bath may be directly made with the compounds to be brought on the fibre while adding a saponifier.

The following examples will servefo further illustratefmy present invention which however is not restricted to these examples;

- Eeam u 1.

, 2 parts by weight of 3-amino-benzanthrone corresponding to the formula alene-sulfonic' are dissolved or dispersed in a suitable 'amount of neutralized Twitchells'reagent and then added to from 2000 to 3000 parts of water which may contain a little soap, as usual; 100 parts of cellulose acetate silk are dyed at from to degrees centigr. when a beautiful strongly fluorescent yellow shade is roduced. v

ith 1 percent of Ba l-amino-benzanthrone corresponding to the formula a bright is obtained.

. Example 2.

'litre of dye bath area proper concentration,

the dyestufi being-first stirred with the sulionic acid in a concentrated state and then added to the dyebath.

Other saponifiers and other diflicultly soluble dyetufis or coloring matters, or comnentsof dyestufis ma be used in a simiar way, for example a pha naphthylamine (diaz)+nieta-phenylene-diamine, alpha amino-al ha-naphth uinone, 8-nitro-2-ammona ht alene methy violet base, alpha napl 1- thy lamine (diaz) ;-|-para-hydroxybenzo1c acid and others.

What I claim is: 1. The

' recess of producing dyeings on. a detate silk, which consists'in employing substances suitable for dyein celpractically insoluble in water, in conjunclulose acetate silk, dlflicultly soluble in tion with a saponifier of the alkylated haphwater, in conjunction with a fat catalytic thalene sulfonic acid type. 1

organic sapomfier In testimony whereof I have hereunto set 2. The process of pioducing dyeings on my hand.

cellulose acetate silk, which consists in em- 1 i ploying a colored anthraquinone derivative RICHARD METZGER. 

